JP2006226102A - Connecting joint of steel pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely connect the lower pile and the upper pile of a steel pipe in simple constitution without welding. <P>SOLUTION: In this connecting joint of the steel pipe, a short pipe 3 having a plurality of L-shaped locking grooves 4 is welded in the head of the steel pipe lower pile 1, the inner surface of the lower part of the upper pile 2 is provided with locking pieces 6 engaged with the locking grooves 4, and the joint is provided with wedge plates 7 for locking the locking pieces 6 in the locking grooves 4. The locking grooves 4 are provided with a vertical groove 4a, the upper part of which is opened, and a lateral groove 4b extending from the lower part of the vertical groove 4a in the circumferential direction, the locking pieces 6 can be moved from the vertical groove 4a to the lateral groove 4b with the rotation of the upper pile 2, and the wedge plates 7 are placed on the locking pieces 6. With the movement of the locking pieces 6 to the lateral grooves 4b, the wedge plates are detached from the locking pieces 6 to fall down in the vertical grooves 4a, thereby closing the lateral grooves 4b, and the locking pieces 6 are locked in the lateral grooves 4b to connect and fix the upper and lower piles 1, 2 to each other. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a steel pipe joint for connecting a steel pipe pile and a lower pipe and an upper pipe of a steel pipe column used in civil engineering construction work.

  In order to reinforce the soft ground, steel pipes are often used for construction and civil engineering work. In general, welded joints are often used as joints between lower piles and upper piles, that is, joints between steel pipes. However, welding joints require a longer time for welding as the pile thickness and pile diameter increase, and the construction machine loss and worker labor costs are added during that time, resulting in higher costs. Moreover, although the connection site | part requires the same intensity | strength as a pile main body intensity | strength, welding work conditions are greatly influenced by the weather, and it is difficult to weld uniformly over a long time.

  Therefore, various attempts have been made to connect steel pipes without requiring welding at a construction site. For example, it was attempted to use a flange joint, but in the flange joint, the outer diameter of the flange portion is larger than the outer diameter of the steel pipe and protrudes greatly from the outer peripheral surface of the steel pipe, so when embedding the steel pipe in the ground, Not only does it cause large penetration resistance, but bending moments act on the joints, and a space is created on the outer periphery of the steel pipe between the joints, which can lead to problems such as the possibility that horizontal support force cannot be secured. .

  Further, as other non-welded joints, for example, an annular groove or an annular ridge is provided on the outer peripheral surface, and a joint that is welded to the end of the steel pipe in advance, An annular ridge or annular groove that meshes with the strip is formed on the inner peripheral surface, the outer peripheral surface is formed in a tapered shape, a cylindrical inner ring member divided into a plurality of pieces, and a tapered surface on the inner peripheral surface The outer ring member is formed and covered with the inner ring member, and when connecting the steel pipes, the joint portions are first butted together and the inner ring member divided into a plurality of pieces is put on the outer peripheral surface, Then, the outer ring member is put on the outer side of the inner ring member, and the inner ring member is added by utilizing the wedge effect between the tapered surface of the outer peripheral surface of the inner ring member and the tapered surface of the inner peripheral surface of the outer ring member. There is something that is tightened to the outer peripheral surface of the part (Patent Literature) , Reference 2).

  Although this non-welded joint does not cause the above-mentioned problem in the connection structure using the flange joint, when the outer ring member is attached to the outside of the inner ring member, the steel pipe embedded in the ground is interposed via a pedestal. Multiple hydraulic cylinders, and it is necessary to push up the outer ring member by these hydraulic cylinders and fit it to the outside of the inner ring member. It is difficult to push up the member, and there is a problem that it is difficult to fit the inner ring member when the outer ring member is tilted to some extent.

  Therefore, in order to connect the steel pipes without using a tool such as a hydraulic jack, in order to connect the pair of joint blocks each formed with an engagement recess opening at the peripheral edge, and the pair of joint blocks, A connecting ring member that is divided into a plurality of ring member pieces in the circumferential direction, and one ring member piece of the plurality of ring member pieces is used as a fixing ring member piece. The other ring member piece is held on the outer peripheral surface of the pair of joint blocks by the ring member piece for fixation and supports the pin engaged with the engaging recess. The joint block is attached to each of the connection ends of the piles to be connected, and the end face of the other joint block faces the end face of the one joint block, and the engagement recesses face each other. The other ring member piece is put on the outer peripheral surface of the pair of joint blocks so that the pin enters from the opening of the engagement recess and engages with the engagement recess, There has been proposed a joint joint in which a fixing ring member piece is placed on the outer peripheral surfaces of the one joint block and the other joint block and fixed via the fixing means (see Patent Document 3).

  However, this joint also has a problem that the structure is complicated such as a connection ring member and a ring member piece other than the joint block, and the cost is high.

Furthermore, the following Non-Patent Document 1 describes a backing ring member stoper and backing ring member of the inner diameter of the lower pile head of a steel pipe, welding groove machining and semi-automatic welding field joint at the lower end of the upper pile, and standard welding conditions. ing.
However, when these conventional semi-automatic welding field joints are used, the welding strength is easily influenced by the strength of the wind and rain and the ability of the welder, even though the connection point is required to have the same strength as the steel pipe body. It is difficult to perform uniform field welding throughout. Furthermore, there is a problem that a long time is required for X-ray (X-ray) or high-frequency inspection and color check for construction management at a construction site.

Utility Kaihei 5-81326 JP-A-9-119132 JP 2000-64273 A Published on April 1, 2016, “Pipes-Design and Construction” on page 514, JASPP joint (JTPP, Semi-automatic welding joint)

The present invention has been made in view of the problems of the above-described conventional steel pipe joints, and the object thereof is a simple configuration regardless of the thickness and diameter of the steel pipe, regardless of the welding, and thus at a low cost. It is to ensure that steel pipes can always be connected reliably regardless of the weather, etc. Specifically, a technically problematic connection means is attached to the steel pipe in the production plant and set at the construction site. It is to provide a joint joint that can connect the upper and lower steel pipes without welding.
Moreover, it is to make it possible to easily disconnect the steel pipe once connected.

According to the first aspect of the present invention, a short pipe having a plurality of locking grooves is integrally attached in a head portion of the lower pipe, and locking means is provided on the inner surface of the lower portion of the upper pipe so as to fit the locking groove. A steel pipe joint having wedge means for locking the locking means to the locking groove, the locking groove being formed in a circumferential direction from a vertical groove having an upper part opened and a lower part of the vertical groove. A transverse groove extending from the longitudinal groove, and being able to enter the transverse groove as the upper tube rotates, and the wedge means is placed on the locking means, and the locking means Along with the intrusion into the lateral groove, it is detached from the locking means and falls in the vertical groove to close the horizontal groove, and the locking means and the locking groove are linked and locked.
According to a second aspect of the present invention, in the steel pipe joint according to the first aspect, the locking means is a plate-like body having a width substantially equal to the transverse groove, and the wedge means is substantially the vertical groove. It is a plate-like body having an equal width.
According to a third aspect of the present invention, in the joint joint according to the first or second aspect, the upper pipe supports the wedge means placed on the locking means, and the upper portion thereof is movable in the circumferential direction. Guiding support means for guiding is provided.
According to a fourth aspect of the present invention, in the joint joint according to any one of the first to third aspects, a reinforcing plate serving as a groove bottom of the locking groove is integrally provided on the inner surface of the short pipe. And
According to a fifth aspect of the present invention, in the steel pipe joint according to any one of the first to fourth aspects, the locking groove includes at least two lateral grooves between an opening and a lower portion, It has at least two locking means corresponding to the horizontal groove and accommodated in the horizontal groove when locked.
According to the sixth aspect of the present invention, a short pipe provided with a plurality of plate-like members spaced apart from each other along the outer surface is integrally attached in the head of the lower pipe, and the inner surface near the lower end of the upper pipe is A steel pipe in which a plurality of locking means are provided corresponding to the gaps between the plate-like members, and a plurality of wedge means for locking the locking means to the short pipe are mounted on the locking means. It is a joint joint, and the locking means is capable of passing between the plate-like members when the short tube and the upper tube are fitted, and is connected to the plate-like member of the short tube and the lower member as the upper tube rotates. The wedge means is capable of entering the gap between the tubes, and the wedge means falls from the locking means as the locking means enters the gap, and the locking means and the plate-like member are linked and locked. It is characterized by doing.
According to a seventh aspect of the present invention, in the joint for steel pipe according to the sixth aspect, the locking means and the wedge means are both plate-shaped, and both have a width substantially equal to the gap between the plate-shaped members. And the upper part of the locking means is joined to a ring member.
In the invention of claim 8, a short pipe provided with a plurality of plate-like members spaced apart along the inner face is integrally attached to the outer surface of the head portion of the lower tube, and is attached to the outer surface near the lower end portion of the upper tube. A steel pipe joint comprising a plurality of locking means corresponding to the gaps between the plate-like members, and a plurality of wedge means for locking the locking means to the short pipe, The locking means can pass between the plate-like members when the short tube and the upper tube are fitted, and can enter the gap between the plate-like member of the short tube and the lower tube as the upper tube rotates. And the wedge means is inserted between the plate-like members in a state where the locking means has entered the gap, and interlocks and locks the locking means and the plate-like member. .
According to a ninth aspect of the present invention, in the steel pipe joint according to the eighth aspect, the wedge means is formed between the short pipe and the upper pipe when the short pipe and the upper pipe are fitted together. It is characterized in that it can be inserted and removed from a gap opened to the outside.
The invention of claim 10 is the steel pipe joint according to any one of claims 6 to 9, wherein the lower end of the plate-like member has a notch step portion or an inclined portion, and the upper end of the locking means. Has a notch step portion or an inclined portion corresponding to the notch portion or the inclined portion of the plate-like member, and when the locking means enters the gap between the plate-like member of the short tube and the lower tube, the plate The notch step portion or the inclined portion of the locking member and the locking means are engaged with each other.

According to the present invention, it is possible to easily and reliably connect steel pipes without requiring welding work at a construction site and with a simple configuration, and therefore, at low cost regardless of the diameter and thickness of the steel pipe or the skill of the operator. can do.
In addition, the connected steel pipe can be easily disconnected.

1st Embodiment of the joint joint of this invention is described according to an accompanying drawing.
FIG. 1 is a perspective view showing upper and lower pipes having joined joints made of steel pipes according to the present embodiment, here, upper and lower piles, and FIG. 2A shows a part of the joint portion to show the structure of the joint. FIG. Further, FIG. 2B is a perspective view showing a state before connection of the upper pile and the lower pile each incorporating the joint, and FIG. 3 shows a joint portion of the upper pile and the lower pile in order to explain the connection procedure of the joint. It is the disassembled perspective view shown with the partial cross section.

  In FIG. 1, reference numeral 1 denotes a lower pile, and reference numeral 2 denotes an upper pile connected to or joined to the lower pile 1. A short tube 3 made of a steel cylindrical tube having an outer diameter matching the inner diameter of the head and having a predetermined thickness is welded to the upper end portion of the lower pile 1, that is, the head thereof. The short tube 3 has a plurality of notches 4 that are L-shaped bag grooves having a wide side view in which a locking groove, that is, an upper end is opened and a lower portion including the lower end extends in the circumferential direction, at substantially equal intervals along the circumference. Individually formed. Further, a reinforcing plate 5 is integrally welded inside the short tube 3 along the entire inner periphery of the short tube 3, and the reinforcing plate 5 constitutes the groove bottom in the L-shaped bag groove 4 portion, The strength reduction of the short pipe 3 due to the notch of the L-shaped groove is reinforced.

On the other hand, in the vicinity of the lower end of the upper pile 2, that is, the connection portion with the lower pile 1, as shown in the exploded view of FIG. A plurality of rectangular plate-like locking pieces 6 serving as stopping means are welded in the circumferential direction, and the upper part of the wedge plate 7 serving as wedge means placed on the locking piece 6 is guided in the circumferential direction. A plurality of guide rods 9 are provided along the circumferential direction corresponding to the L-shaped bag groove 4 on the inner periphery of the upper pile 2.
Here, the wedge plate 7 has a rectangular plate shape as shown in the figure, and has a width that is the same as that of the locking piece 6 and is longer than that. The lower end of the wedge plate 7 is placed on the locking piece 6. And the upper part is supported by the upper pile 2 in the state which can be relatively moved to the circumferential direction with respect to the upper pile 2, while preventing fall with the said guide rod 9, as shown to FIG. 2B.

When embedding a steel pipe, the lower pile 1 is rotated and propelled into the ground and buried with no soil, and when the tip of the lower pile 1 reaches a predetermined depth, the upper pile 2 is connected to the upper end of the lower pile 1 Repeat as many times as necessary.
At that time, the connection between the lower pile 1 and the upper pile 2 is as follows. First, the upper pile 2 is arranged on the lower pile 1 buried in the ground, and as shown in FIG. The L-shaped bag groove 4 and the locking piece 6 provided in the vicinity of the connection end of the upper pile 2 are aligned, and then the upper pile 2 is lowered as indicated by an arrow Y, as shown in FIG. 3B. As described above, the locking piece 6 is inserted into the L-shaped bag groove 4 of the lower pile 1, and the descent is stopped when the lower end of the locking piece 6 contacts the lower end of the L-shaped bag groove 4.

  Subsequently, when the upper pile 2 is rotated in the direction of arrow R in FIG. 3B, that is, in the clockwise direction, the locking piece 6 attached integrally with the upper pile 2 is rotated together with the upper pile 2, and the L-shaped bag It penetrates into the lateral groove 4 b extending in the circumferential direction of the groove 4. On the other hand, the wedge plate 7 tries to rotate together with the locking piece 6 on the locking piece 6, but as a result of the side surface hitting the side surface of the vertical groove 4 a of the short tube 3 and being prevented from rotating, the locking piece 6 becomes L-shaped. As it enters the lateral groove 4 b of the mold bag groove 4, relative movement occurs with respect to the upper surface of the locking piece 6, and eventually comes off from the upper surface of the locking piece 6.

When the wedge plate 7 is released from the locking piece 6, it falls in the vertical groove 4 a of the L-shaped bag groove 4, and the lower end of the wedge plate 7 hits the groove bottom 4 c of the L-shaped bag groove 4 and stops. In this state, as shown in FIG. 3C, the wedge plate 7 and the locking piece 6 are arranged side by side on the groove bottom portion 4c of the L-shaped bag groove 4, and the wedge plate 7 blocks the lateral groove 4b. The movement of the locking piece 6 is restricted by the wedge plate 7 in the circumferential direction and the lateral groove 4b in the upper and lower directions, and can no longer come out of the lateral groove 4b. In this way, the lower pile 1 and the upper pile 2 are completely linked and integrated through the locking piece 6, the L-shaped bag groove 4 and the wedge plate 7.
Therefore, the rotational torque from the upper pile 2 can be transmitted to the lower pile 1. After connecting the upper pile 2 to the lower pile 1, the lower pile 1 is further rotated and propelled into the ground, and this pile is repeated until the tip of the lower pile 1 reaches the ground with a predetermined hardness. .

Next, a second embodiment of the joint joint according to the present invention will be described.
4A to 4C are broken perspective views illustrating the connection procedure of the joint joint according to the second embodiment. FIGS. 4D and 4E are a bag groove, a locking piece and a wedge plate in FIGS. 4A and 4C, respectively. It is the expanded view which showed typically the relationship.
The difference between the joint joint shown in FIG. 4 and the joint joint according to the first embodiment shown in FIG. 1 to FIG. 3 is that the bag groove 4 of the short pipe 3 is a vertical groove L-shaped bag having a different length of the vertical groove. The shape is the same as when two grooves are arranged side by side, that is, the upper portion is wide and the lower portion is narrow. Correspondingly, the locking piece 6 is locked on the inner surface near the lower end of the upper pile 2. It is welded to the upper and lower two stages shifted by the circumferential width of the piece 6, and the wedge plate 7 is also similar to the case where two rectangular wedge plates having different lengths in the first embodiment are arranged side by side. As shown in the figure, the upper part is wide and the lower part is narrow.

  In order to connect the upper and lower piles 1 and 2 using the joint joint of this configuration, similarly to the first embodiment, the upper pile 2 is arranged on the lower pile 1 buried in the ground, Alignment of the bag groove 4 of the short pipe 3 of the lower pile 1 and the locking pieces 6a and 6b provided in the vicinity of the connection end of the upper pile 2 is performed, and then the upper pile 2 is lowered, and FIG. 4A The upper and lower two-stage locking pieces 6a and 6b are inserted into the vertical grooves 4a of the bag groove 4 of the lower pile 1, and the lower ends of the locking pieces 6a and 6b are respectively The lowering is stopped when it comes into contact with the lower groove bottoms 4c1 and 4c2 (FIG. 4D).

  Subsequently, when the upper pile 2 is rotated in the direction of arrow R in FIG. 4A, that is, in the clockwise direction, the locking pieces 6a and 6b attached integrally with the upper pile 2 are rotated together with the upper pile 2 to respectively It penetrates into the upper and lower lateral grooves 4b1, 4b2 extending in the circumferential direction of the groove 4. At this time, the wedge plate 7 placed on the locking pieces 6a and 6b also tries to rotate together. However, as in the first embodiment, the wedge plate 7 has a side surface of the longitudinal groove 4a of the short tube 3. Since the rotation is blocked by the side surface, as the locking pieces 6a and 6b enter the lateral grooves 4b1 and 4b2 of the bag groove 4, relative movement occurs between the upper ends of the locking pieces 6a and 6b. 6a and 6b come off and fall in the vertical groove 4a.

When the wedge plate 7 falls in the vertical groove 4a of the bag groove 4, the lower end of the wedge plate 7 hits the upper and lower groove bottom portions 4c1 and 4c2 of the bag groove 4 and stops (FIG. 4E). In this state, the wedge plate 7 and the locking pieces 6a and 6b are arranged side by side on the upper and lower groove bottom portions 4c1 and 4c2 of the bag groove 4, respectively, and the wedge plate 7 is connected to the lateral grooves 4b1 and 4b2. As a result of restraining the movement of the locking pieces 6a, 6b in the circumferential direction and restraining the locking pieces 6a, 6b in the lateral grooves 4b1, 4b2, the lower pile 1 and the upper pile 2 are completely linked and integrated.
In this embodiment, since the locking piece and the bag groove are locked at the upper and lower positions, the connection between the upper and lower piles 1 and 2 is further strengthened.
It is possible to further increase the number of steps of the locking piece and the bag groove, and as the number of steps increases, the connection strength increases. On the other hand, the configuration becomes complicated, so the optimum number of steps is set as necessary. .

Next, a third embodiment of the joint joint according to the present invention will be described.
FIG. 5 is a view similar to FIG. 1 of the third embodiment. As shown in the drawing, a plurality of plate-like members 15 described later are provided instead of the L-shaped bag groove of the first embodiment.
FIG. 6A is a perspective view showing the lower pile 1 and the upper pile 2 provided with the steel pipe joint joint according to the third embodiment, and shows the upper pile-side joint joint provided in the vicinity of the joint end of the upper pile 2. For this purpose, the vicinity of the connection end of the upper pile 2 is shown as a ring. Moreover, FIG. 6B is the fracture | rupture perspective view which deleted the surface side of the upper pile 2 in FIG. 6A, and showed the inside in order to show the structure of an upper pile side joint joint, Furthermore, FIG. 6C is an upper pile side It is sectional drawing which showed the coupling and the lower pile side coupling, respectively.

  As shown in FIG. 6A, the lower pile side joint is inserted by welding the short pipe 3 around which the ring member 14 having an outer diameter substantially equal to the head inner diameter of the lower pile 1 of the steel pipe is inserted into the lower pile 1, In addition, on the upper outer peripheral surface of the short tube 3, a plate-like member having an inner peripheral surface shape that matches the outer peripheral surface of the short tube 3, that is, a plate body (also referred to as a square outer curved plate) 15 having a substantially rectangular shape in front view, etc. It is formed by welding a plurality at intervals.

  On the other hand, as shown in FIG. 6B, the upper pile side joint has a substantially equal interval corresponding to the plate-like member 15 on the lower pile 1 side on the inner peripheral surface in the vicinity of the joint end with the lower pile 1 of the upper pile 2. And a plurality of locking pieces (also referred to as square bent plates) 16 having an outer peripheral surface shape equal to the inner diameter of the upper pile 2 and having a substantially rectangular shape in plan view, and placed on the locking pieces 16. The wedge plate 17 having the same width as the locking piece 16 and having a longitudinal length longer than that of the locking piece 16 is substantially rectangular in plan view, and is welded to the upper ends of the plurality of wedge plates 17. Each wedge plate 17 includes an upper ring member 18 that has an outer surface constituting a cylindrical surface substantially equal to the inner diameter of the upper pile 2. Also, as shown in FIG. 6C, the screw 30 is screwed into the screw hole 2a on the outer periphery of the upper pile 2 as shown in FIG. Has been.

  In order to connect the upper and lower piles 1 and 2 provided with the joint joint of the third embodiment, the upper pile is placed on the lower pile 1 buried in the ground as in the first and second embodiments. 6 and positioned so that the plate-like member 15 of the short pipe 3 of the lower pile 1 and the locking piece 16 provided near the connection end of the upper pile 2 are staggered as shown in FIG. 6C. Subsequently, the upper pile 2 is lowered as indicated by the arrow Y, and as shown in FIG. 7A, the locking piece 16 is inserted into the gap between the plate-like members 15 on the lower pile 1 side, and the locking piece The lowering is stopped when the lower end of 16 comes into contact with the lower ring member 14.

  Subsequently, when the screw 30 (FIG. 6C) is removed to release the wedge plate 17 and the upper pile 2 is rotated in the direction of arrow R in FIG. 7B, that is, clockwise, the upper pile 2 is attached integrally. The locking piece 16 rotates with the upper pile 2 and enters the gap 20 between the lower side of the plate-like member 15 and the lower ring member 14. On the other hand, the wedge plate 17 tries to rotate on the locking piece 16 together with the wedge piece 17, but as a result of the side surface hitting the side surface of the plate-like member 15 and being prevented from rotating, the locking piece 16 is moved to the plate-like member 15. As it enters the lower gap 20, relative movement occurs with respect to the upper surface of the locking piece 16, and eventually comes off the upper surface of the locking piece 16.

When the wedge plate 17 is detached from the locking piece 16 and falls in the gap 19 between the plate-like members, the lower end of the wedge plate abuts against the lower ring member 14 and stops. In this state, as shown in FIG. 7C, the wedge plate 17 and the locking piece 16 are arranged side by side on the lower ring member 14, and the locking piece 16 is circumferentially moved by the wedge plate 17, and The upper and lower directions are restrained by the plate-like member 15 and the lower ring member 14 and can no longer escape from the gap 20. In this way, the lower pile 1 and the upper pile 2 are completely linked and integrated through the plate-like member 15, the locking piece 16, and the wedge plate 17.
Therefore, the rotational torque from the upper pile 2 can be transmitted to the lower pile 1.
After connecting the upper pile 2 to the lower pile 1, the lower pile 1 is further rotated and propelled into the ground in the same manner as in the case of using the joint joints of the first and second embodiments. This connection is repeated until the ground reaches a ground with a predetermined hardness, and the piles are added.

Furthermore, a fourth embodiment of the joint joint according to the present invention will be described.
FIG. 8 is a perspective view showing the lower pile 1 and the upper pile 2 having the steel pipe joint joint according to the fourth embodiment, and FIG. 8A is an upper pile side joint provided near the joint end of the upper pile 2. FIG. 8B is a perspective view showing the head of the lower pile 1, in which the vicinity of the connection end of the upper pile 2 is cut and broken to show the joint.

  As shown in FIG. 8B, the lower pile side joint is welded by inserting the short pipe 3 around which the ring member 14 having an outer diameter substantially equal to the inner diameter of the head of the lower pile 1 of the steel pipe is inserted into the lower pile 1. In addition, the upper outer peripheral surface of the short tube 3 has an inner peripheral surface and an outer peripheral surface shape that match the outer peripheral surface of the short tube 3 and is substantially rectangular in front view, and has a notch step formed by a rectangular notch at one side lower end thereof. A plurality of plate-like members (also referred to as corner bend plates) 25 having portions 25a are welded at equal intervals.

  On the other hand, as shown in FIG. 8A, the upper pile side joint 2 is substantially corresponding to the plate-like member 25 on the lower pile 1 side on the inner peripheral surface in the vicinity of the joint end with the lower pile 1 of the upper pile 2. A plan view substantially having an outer peripheral surface shape equal to the inner diameter of the upper pile 2 and welded at equal intervals, and provided with a notch step portion 26a corresponding to the notch step portion 25a of the plate-like member 25 on the upper end side thereof. A plurality of rectangular locking pieces (also referred to as curved corner plates) 26, and placed on the locking pieces 26, have the same width as the locking pieces 26, and the length in the vertical direction is the locking pieces. A wedge plate 27 having a substantially rectangular shape in plan view longer than the piece 26 and further welded to the upper ends of the plurality of wedge plates 27 so that the outer surface of each wedge plate 27 forms a cylindrical surface substantially equal to the inner diameter of the upper pile 2. The upper ring member 28 is made up of. Further, in order to fix the wedge plate 27 in a state of being placed on the locking piece 26, a screw 30 is screwed into the screw hole 2 a on the outer periphery of the upper pile 2 as shown in FIG. 8B.

  In order to connect the upper and lower piles having the joint joint of the fourth embodiment, the upper pile 2 is placed on the lower pile 1 buried in the ground as in the first to third embodiments. It arrange | positions and it positions so that the said plate-shaped member 25 of the short pipe 3 of the lower pile 1 and the said locking piece 26 provided in the connection end vicinity of the upper pile 2 may become alternate, and then, the upper pile 2 Is lowered in the direction indicated by the arrow Y in FIG. 9A, and the locking piece 26 is inserted into the gap 29 between the plate-like members 25 on the lower pile 1 side. Stops when it comes into contact with the lower ring member 14.

Subsequently, when the screw 30 is removed to release the fixation of the wedge plate 27 and the upper pile 2 is rotated in the direction of the arrow R in FIG. 9B, that is, in the clockwise direction, the locking piece 26 attached integrally with the upper pile 2. Rotates with the upper pile 2 and enters the gap 20 between the lower side of the plate-like member 25 and the lower ring member 14. Then, the rotation is stopped in a state where the notch step portion 26a on the upper end side (opposite to the rotation direction) of the locking piece 26 and the corresponding notch step portion 25a of the plate-like member 25 are completely matched.
On the other hand, the wedge plate 27 tries to rotate on the locking piece 26 together with the wedge plate 27, but as a result of the side surface hitting the side surface of the plate-like member 25 and being prevented from being rotated, As it enters the lower gap 20, relative movement occurs with respect to the upper surface of the locking piece 26 and eventually comes off the upper surface of the locking piece 26.

When the wedge plate 27 is removed from the locking piece 26 and falls in the gap between the plate members 25, the lower end of the wedge plate 27 abuts against the lower ring member 14 and stops. In this state, the wedge plate 27 and the locking piece 26 are arranged side by side on the lower ring member 14, respectively, and the locking piece 26 is restrained in the circumferential direction and the upper and lower directions, and the lower pile 1 and the upper The pile 2 is completely connected and integrated through the plate-like member 25, the locking piece 26, and the wedge plate 27. Moreover, since the plate-like member 25 and the locking piece 26 are engaged with each other at the notch step portions 25a and 26a, the engagement is further strengthened.
Therefore, the rotational torque from the upper pile 2 can be reliably transmitted to the lower pile 1.
After connecting the upper pile 2 to the lower pile 1, the lower pile 1 is further rotated and propelled into the ground in the same manner as when using the joint joints of the above embodiments, and the tip of the lower pile 1 has a predetermined hardness. Repeat this connection process until the ground reaches the ground, and add piles.

Furthermore, a fifth embodiment of the joint joint according to the present invention will be described.
FIG. 10 is a perspective view showing a lower pile 1 and an upper pile 2 having a steel pipe joint joint according to the fifth embodiment, and FIG. 10A is an upper pile side joint provided near the joint end of the upper pile 2. FIG. 10B is a perspective view showing the head of the lower pile 1, in which the vicinity of the connection end of the upper pile 2 is cut and broken to show the joint.

  As shown in FIG. 10B, the lower pile side joint is obtained by extrapolating a short pipe 3 a in which an annular member 14 a having an inner diameter substantially equal to the outer diameter of the head of the lower pile 1 of the steel pipe is welded to the lower pile 1. The upper inner peripheral surface of the short tube 3a is substantially rectangular in front view with an inner peripheral surface and an outer peripheral surface shape matching the inner peripheral surface of the short tube 3a, and at the lower end on one side thereof A plurality of plate-like members (also referred to as outer corner curved plates) 25 each having a notch step portion 25a formed by a rectangular notch are welded at equal intervals.

  On the other hand, as shown in FIG. 10A, the upper pile side joint has substantially equal intervals corresponding to the plate-like member 25 on the lower pile 1 side on the outer peripheral surface in the vicinity of the joint end with the lower pile 1 of the upper pile 2. And has an inner peripheral surface shape equal to the outer shape of the upper pile 2 and has a rectangular shape in plan view provided with a notch step portion 26a corresponding to the notch step portion 25a of the plate-like member 25 on one upper end side thereof. And a plurality of locking pieces (also referred to as corner bent plates) 26.

  In order to connect the upper and lower piles 1 and 2 provided with the joint joint of the fifth embodiment, the upper is placed on the lower pile 1 buried in the ground as in the first to fourth embodiments. Place the pile 2 and align the plate-like member 25 of the short pipe 3a of the lower pile 1 and the locking piece 26 provided in the vicinity of the connection end of the upper pile 2 alternately, Similarly to the embodiments described above, the upper pile 2 is lowered in the direction of arrow Y in FIG. 10, and the engaging piece 26 is inserted into the gap 29 between the plate-like members 25 on the lower pile 1 side. When the lower end of 26 comes into contact with the annular member 14a, the descent is stopped (FIG. 11A).

  Subsequently, when the upper pile 2 is rotated in the direction of the arrow R in FIG. 11B, that is, in the clockwise direction, the locking piece 26 attached integrally with the upper pile 2 rotates together with the upper pile 2, It penetrates into the gap 20 between the lower side and the annular member 14a. Then, the rotation is stopped in a state where the notch step portion 26a on the upper end side (opposite to the rotation direction) of the locking piece 26 and the corresponding notch step portion 25a of the plate-like member 25 are completely matched.

Then, when the wedge plate 27 is inserted into the gap between the plate-like members 25 as shown in FIG. 11C, the lower end of the wedge plate 27 abuts against the annular member 14a and stops, and as shown in FIG. 11D, the wedge plate 27 And the locking pieces 26 are arranged side by side on the annular member 14a, the locking pieces 26 are restrained in the circumferential direction and the upper and lower directions, and the lower pile 1 and the upper pile 2 are the plate-like members 25. The connection piece is completely connected and integrated through the locking piece 26 and the wedge plate 27. Moreover, since the plate-like member 25 and the locking piece 26 are engaged with each other at the notch step portions 25a and 26a, the engagement is further strengthened.
Therefore, the rotational torque from the upper pile 2 can be reliably transmitted to the lower pile 1.
After connecting the upper pile 2 to the lower pile 1, the lower pile 1 is further rotated and propelled into the ground in the same manner as when using the joint joints of the above embodiments, and the tip of the lower pile 1 has a predetermined hardness. Repeat this connection work until the ground reaches the ground, and add piles.
In particular, when the engagement joint of the present embodiment is used, the wedge plate 27 is exposed along the outer periphery of the connection portion of the upper pile 2 and can be removed. That is, when the pile is buried in the ground and then pulled out, the wedge plate of the joint joint portion is pulled out, and then the plate member 25 and the locking piece 26 are disengaged from each other, so that the upper and lower piles Can be easily separated.

In the fourth and fifth embodiments, the notch step portions 25a and the notch step portions 26a of the plate member 25 and the locking piece 26 may be formed as inclined surfaces instead of these notch step portions. it can.
That is, in the figure explaining the engagement state of the plate-like member 25 and the locking piece 26 of another example with respect to the fifth embodiment of FIG. 12, as shown in FIG. The lower surface of the stop piece 26 may be provided with parallel inclined surfaces 25b and 26b opposite to each other, and as shown in FIG. 12B, the two inclined surfaces 25b and 26b may be engaged with each other when the joint joint is connected. The inclined surface may be provided on the entire joining surface of the plate-like member 25 and the locking piece 26 or may be provided on a part thereof.

A sixth embodiment of the joint joint according to the present invention will be described.
FIG. 13: is a perspective view which shows the joint joint of the steel pipe which concerns on 6th Embodiment, FIG. 13A is a disassembled perspective view of the top pile in the vicinity of a junction part, a lower pile, and a wedge board, FIG. It is a perspective view which shows a lower end part and the head of the lower pile 1 transparently. FIG. 14 is a perspective view showing a short pipe portion, FIG. 14A is a perspective view in which a part of the short pipe constituting the joint of the lower pile is deleted, and FIG. 14B is a diagram of FIG. It is the same figure which shows the state which attached the short pipe of 14A to the lower pile.

  As shown in FIG. 13A as a whole, the joint of this embodiment includes a locking piece 26 provided on the outer periphery of the lower end of the upper pile 2 at, for example, equal intervals, and a short pipe 3 a fitted to the outer periphery of the upper end of the lower pile 1. And a wedge plate 27.

As shown in FIGS. 13A and 13B, the lower pile side joint is composed of a short pipe 3a that is fitted and welded to the outer periphery of the head of the lower pile 1, and the short pipe 3a is, for example, as shown in FIG. 14A, A lower inner diameter approximately equal to the outer diameter of the head of the lower pile 1 of the steel pipe, and an upper inner diameter larger than the lower inner diameter so that the lower end of the upper pile 2 provided with a locking piece 26 on the outer periphery can be inserted. The boundary of the inner diameter is a step 3b. The upper inner diameter portion has a substantially rectangular plate-like member as viewed from the front and has an inner peripheral surface corresponding to the inner peripheral surface shape from the upper end portion inward and an inner peripheral surface corresponding to the outer peripheral surface of the upper pile 2. A plurality of 25 (also referred to as outer corner curved plates) are welded at equal intervals.
FIG. 14B shows a state in which the short pipe 3a is fitted and welded to the head of the lower pile 1, and the upper end of the lower pile 1 is inserted up to the stepped portion 3b as shown in the figure. Between the upper end of the pile 1 and the plate-like member 25, as will be described later, an interval is formed that can accommodate the locking piece 26 of the upper pile 2 when the upper and lower piles are connected.

  As shown in FIGS. 13A and 13B, the joint on the upper pile side includes a plurality of engagement members welded to the outer peripheral surface of the lower end portion of the upper pile 2 at substantially equal intervals corresponding to the plate-like member 25 of the short pipe 3a. It consists of a stop piece (also called a corner curved plate) 26. Here, each locking piece 26 is curved corresponding to the outer peripheral surface of the upper pile 2 as shown in the figure and is substantially rectangular in plan view.

  In order to connect the upper and lower piles 1 and 2 provided with the joint joint of the sixth embodiment, the upper pile 2 is placed on the lower pile 1 buried in the ground as in the fifth embodiment. Are arranged so that the locking piece 26 provided at the connecting end and the plate-like member 25 of the short pipe 3a of the lower pile 1 are staggered, and then, as shown in FIG. 15A, the upper pile 2 Is lowered in the direction of arrow Y, and the locking piece 26 of the upper pile 2 is inserted into the gap 29 between the plate-like members 25 on the lower pile side, and lowered until the lower end of the locking piece 26 contacts the step 3b. (FIG. 15B).

  Subsequently, when the upper pile 2 is rotated in that state, for example, in the direction of the arrow R in FIG. 16A, that is, in the clockwise direction, the locking piece 26 provided integrally with the upper pile 2 is also rotated. The rotation is stopped in a state in which the locking piece 26 is completely accommodated in the lower side of the plate-like member 25 by entering the gap 20 formed between the lower side of the plate-like member 25 and the upper end of the lower pile 1.

In that state, next, as shown in FIG. 16B, the surface is curved corresponding to the outer peripheral surface of the upper pile 2 and is substantially rectangular in plan view, and preferably approximately the width of the gap 29 between the plate-like members 25. When the same wedge plate 27 is inserted into each gap 20 between the plate-like members 25 of the short tube 3a (that is, dropped in the Y direction), the lower end of the wedge plate 27 comes into contact with the step portion 3b and stops, as shown in FIG. In addition, the wedge plate 27 and the locking piece 26 are arranged side by side on the step portion 3b. In this state, the locking piece 26 is restrained so that it cannot move in any of the circumferential direction and the up / down direction.
In this state, the lower pile 1 and the upper pile 2 are completely connected and integrated via the plate-like member 25, the locking piece 26, and the wedge plate 27. Therefore, when the upper pile 2 is rotated, its rotational torque is reduced. It can be reliably transmitted to the lower pile 1.
Therefore, even when the joint structure according to the present embodiment is used, the tip of the lower pile 1 is connected while repeatedly connecting the upper and lower piles as in the case of using the joint joint of each of the above embodiments. The lower pile 1 can be rotated and propelled into the ground until reaching a ground having a predetermined hardness.

This embodiment does not use the annular member 14a in the fifth embodiment, and achieves its function with the stepped portion 3b. Therefore, in addition to cost reduction due to component reduction, it is necessary to attach the annular member which is a separate component. No work is required, which is excellent in terms of work efficiency and cost.
Further, in the present embodiment as well as the fifth embodiment, the upper end portion of the wedge plate 27 is exposed along the outer periphery of the connecting portion of the upper pile 2 even when the upper and lower piles are connected. Even after, the wedge plate 27 of the joint joint portion is pulled out from between the plate-like members 25 and, for example, the upper pile 2 is rotated in a direction opposite to that at the time of connection, that is, in the counterclockwise direction. Can be easily disengaged. Therefore, for example, after pulling out the buried pile, the upper and lower piles can be easily separated.

  In this embodiment as well, as in the fifth embodiment, stepped portions that engage each other are provided on the joint surface of the wedge piece 25 and the plate-like member 26, or the joint surfaces are formed by inclined surfaces. May be.

It is a perspective view which shows the upper and lower pile provided with the joint joint which concerns on the 1st Embodiment of this invention. FIG. 2A is an exploded perspective view in which a part of the joint portion is broken to show the structure of the joint joint, and FIG. 2B is a perspective view showing a state before connection of the upper pile and the lower pile each incorporating the joint joint. is there. It is the disassembled perspective view which showed the joint part of the upper pile and the lower pile in a partial cross section in order to demonstrate the connection procedure of a joint. 4A to 4C are broken perspective views for explaining the connection procedure of the joint joint according to the second embodiment. FIGS. 4D and 4E are the bag groove, the locking piece and the wedge plate in FIGS. 4A and 4C, respectively. It is the expanded view which showed typically the relationship. It is a figure similar to FIG. 1 of the joint joint which concerns on the 3rd Embodiment of this invention. FIG. 6A is a perspective view showing a lower pile 1 and an upper pile 2 having a steel pipe joint according to the third embodiment, and FIG. 6B is an upper view in FIG. 6A to show the structure of the upper pile-side joint. The fracture | rupture perspective view which deleted the surface side of the pile 2 and showed the inside, and FIG. 6C are sectional drawings which each showed the upper pile side joint and the lower pile side joint. It is the perspective view which deleted and showed a part of upper pile in order to demonstrate the connection procedure of the joint joint which concerns on 3rd Embodiment. FIG. 8A is a perspective view showing a lower pile 1 having a steel pipe joint according to the fourth embodiment, and FIG. 8B is a cutaway perspective view showing the inside by removing the surface side of the upper pile 2. It is the perspective view which deleted and showed a part of upper pile in order to demonstrate the connection procedure of the joint joint which concerns on 4th Embodiment. FIG. 10A is a perspective view showing a lower pile provided with a steel pipe joint according to the fifth embodiment, and FIG. 10B is a cutaway perspective view showing the inside by removing the surface side of the upper pile 2. It is the perspective view which deleted and showed a part of upper pile in order to demonstrate the connection procedure of the joint joint which concerns on 5th Embodiment. It is a figure explaining the engagement state of the plate-shaped member 25 of another Example about 5th Embodiment, and the locking piece 26. FIG. It is a perspective view which shows the coupling of the steel pipe which concerns on 6th Embodiment, FIG. 13A is an exploded perspective view of the upper pile in a junction part metal part, the lower pile with a short pipe, and a wedge board, FIG. It is a perspective view which shows a pipe | tube through. FIG. 14A is a perspective view showing the inside of a joint by removing a part of the short pipe, and FIG. 14B is a state in which the short pipe of FIG. 14A is attached to the lower pile. It is a figure similar to FIG. 14A which shows this. In order to demonstrate the connection procedure of the joint joint which concerns on 6th Embodiment, it is the perspective view which deleted a part of short pipe, and shows the process until dropping an upper pile on a lower pile. It is a figure similar to FIG. 15, and after dropping an upper pile on a lower pile, the process of rotating an upper pile and the process until mounting | wearing with a wedge board after rotation are shown. It is a figure similar to FIG. 15, and shows the state which couple | bonded the upper and lower piles with the coupling joint which concerns on 6th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lower pile, 2 ... Upper pile, 3, 3a ... Short pipe, 4 ... Locking groove (bag groove), 5 ... Reinforcement plate, 6, 16, 26 ... Locking piece, 7, 17, 27 ... wedge plate, 14 ... lower ring member, 14a ... annular member, 15, 25 ... plate member, 18, 28 ... upper ring member.

Claims (10)

A short pipe having a plurality of locking grooves is integrally attached in the head portion of the lower pipe, and locking means for fitting into the locking groove is provided on the inner surface of the lower part of the upper pipe. A steel pipe joint with a wedge means for locking in a locking groove,
The locking groove includes a vertical groove whose upper part is open and a horizontal groove extending in the circumferential direction from the lower part of the vertical groove, and the locking means can enter the horizontal groove as the upper pipe rotates from the vertical groove, The wedge means is placed on the locking means, and when the locking means enters the lateral groove, the wedge means falls off the locking means and falls in the longitudinal groove to close the lateral groove, and The steel pipe joint is characterized in that the locking means and the locking groove are linked and locked. In the steel pipe joint according to claim 1,
The steel pipe joint according to claim 1, wherein the locking means is a plate-like body having a width substantially equal to the transverse groove, and the wedge means is a plate-like body having a width substantially equal to the longitudinal groove. In the joint joint according to claim 1 or 2,
The steel pipe joint has a guide support means for supporting the wedge means placed on the locking means and guiding the upper part of the upper pipe so as to be movable in the circumferential direction. In the joint joint according to any one of claims 1 to 3,
A steel pipe joint according to claim 1, wherein a reinforcing plate serving as a groove bottom of the locking groove is integrally provided on an inner surface of the short pipe. In the steel pipe joint according to any one of claims 1 to 4,
The locking groove includes at least two horizontal grooves between an opening and a lower portion, and has at least two locking means corresponding to the horizontal grooves at the lower end portion of the upper tube and accommodated in the horizontal grooves when locked. Features a steel pipe joint. In the head of the lower pipe, a short pipe provided with a plurality of plate-like members spaced along the outer surface is integrally attached to the upper part of the lower pipe, and a gap between the plate-like members is formed on the inner face near the lower end of the upper pipe. Correspondingly, a plurality of locking means are provided, and a steel pipe joint joint in which a plurality of wedge means for locking the locking means to the short pipe is placed on each locking means,
The locking means can pass between the plate-like members when the short tube and the upper tube are fitted, and enters the gap between the plate-like member of the short tube and the lower tube as the upper tube rotates. And the wedge means drops from the locking means as the locking means enters the gap and interlocks and locks the locking means and the plate-like member. Steel pipe joint. In the steel pipe joint according to claim 6,
Both the locking means and the wedge means are plate-shaped, and both have a width substantially equal to the gap between the plate-shaped members, and the locking means has an upper portion joined to the ring member. Features a steel pipe joint. A short pipe provided with a plurality of plate-like members spaced apart along the inner surface is integrally attached to the outer surface of the head portion of the lower pipe, and the gap between the plate-like members is arranged on the outer surface near the lower end of the upper pipe. A steel pipe joint having a plurality of locking means and a plurality of wedge means for locking the locking means to the short pipe,
The locking means can pass between the plate-like members when the short tube and the upper tube are fitted together, and in the gap between the plate-like member of the short tube and the lower tube as the upper tube rotates. The wedge means is inserted between the plate-like members in a state where the locking means has entered the gap, and the wedge means and the plate-like member are linked and locked. Steel pipe joints. In the steel pipe joint joint according to claim 8,
The coupling of the steel pipe characterized in that the wedge means can be inserted and removed from a gap formed between the short pipe and the upper pipe and opened to the outside when the short pipe and the upper pipe are fitted. Fittings. In the steel pipe joint according to any one of claims 6 to 9,
The lower end of the plate-like member has a notch step portion or an inclined portion, and the upper end of the locking means has a notch step portion or an inclined portion corresponding to the notch portion or the inclined portion of the plate-like member, A steel pipe characterized in that when the locking means enters the gap between the plate-like member of the short pipe and the lower pipe, the plate-like member and the notch step portions or inclined portions of the locking means are engaged. Joint fitting.

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